3. Umar, A (2008). Management of problem soils in the Mineral –Oil producing Areas of Niger Delta. Paper presented at the Training of Trainers Workshop on Rice production for the South-South Geo-Political Zone of Nigeria held at Yenogoa, Bayelsa State on 21st- 30th June, 2008.

4. Umar, A. (2008). Preparation of Compost manure using Roots and Tuber Peels. A Paper presented at the Nassarawa State Monthly Technology Review Meeting (MTRM) held on 27th-28th November, 2008.